该程序通过依次输入已知点个数n，输入已知点的X坐标，输入已知点的Y坐标直接得到经最小二乘法拟合得到的一元线性方程。-The procedure followed by the number of known points in the input n, enter the coordinates of a known point X, Y coordinates of a known point input directly from the least squares fitted by a